A device for handling objects, provided with an attaching means for the objects in which a feeler is movable between two positions within the region of the attaching means, which feeler, if an object is contained in the attaching means, cannot come in the first of the said two positions and when in the first of the said two positions, prevents or changes the normal working of the device. More specifically the invention relates to a device having two attaching means and two feelers such that the device rejects the object, if not both feelers are in the said second position.